Sample holder able to accommodate n. 2 40 mm diameter samples with servo-stepper-motor for the movement of abraded and not abraded samples . Sample holder can be oriented;

Annular diaphragm and circular diaphragm are assembled on a shiftable support with holders. Servo -stepper-motor with driving system for automatic movement of the diaphragms, resolution 1 step, 0,0127 mm;